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Open Access. Powered by Scholars. Published by Universities.®

2018

Astrophysics and Astronomy

Tennessee State University

Articles 1 - 16 of 16

Full-Text Articles in Physical Sciences and Mathematics

Hubble Pancet: An Extended Upper Atmosphere Of Neutral Hydrogen Around The Warm Neptune Gj 3470b, Vincent Bourrier, Alain Lecavelier Des Etangs, David Ehrenreich, Jorge Sanz-Forcada, Romain Allart, Gilda E. Ballester, Lars A. Buchhave, Ofer Cohen, Drake Deming, Thomas M. Evans, Antonio García Muñoz, Gregory W. Henry, Tiffany Kataria, Panayotis Lavvas, Nikole K. Lewis, Mercedes López-Morales, Mark S. Marley, David K. Sing, Hannah R. Wakeford Dec 2018

Hubble Pancet: An Extended Upper Atmosphere Of Neutral Hydrogen Around The Warm Neptune Gj 3470b, Vincent Bourrier, Alain Lecavelier Des Etangs, David Ehrenreich, Jorge Sanz-Forcada, Romain Allart, Gilda E. Ballester, Lars A. Buchhave, Ofer Cohen, Drake Deming, Thomas M. Evans, Antonio García Muñoz, Gregory W. Henry, Tiffany Kataria, Panayotis Lavvas, Nikole K. Lewis, Mercedes López-Morales, Mark S. Marley, David K. Sing, Hannah R. Wakeford

Information Systems and Engineering Management Research Publications

GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve under the irradiation from their host stars. We observed three transits of GJ 3470b in the Lyman-α line with the Hubble Space Telescope (HST) as part of the Panchromatic Comparative Exoplanet Treasury (PanCET) program. Absorption signatures are detected with similar properties in all three independent epochs, with absorption depths of 35 ± 7% in the blue wing of the line, and 23 ± 5% in the red wing. The repeatability of these …

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The Hst Pancet Program: Hints Of Na I And Evidence Of A Cloudy Atmosphere For The Inflated Hot Jupiter Wasp-52b, Munazza K. Alam, Nikolay Nikolov, Mercedes López-Morales, David K. Sing, Jayesh M. Goyal, Gregory W. Henry, Jorge Sanz-Forcada, Michael H. Williamson, Thomas M. Evans, Hannah R. Wakeford, Giovanni Bruno, Gilda E. Ballester, Kevin B. Stevenson, Nikole K. Lewis, Joanna K. Barstow, Vincent Bourrier, Lars A. Buchhave, David Ehrenreich, Antonio García Muñoz Dec 2018

The Hst Pancet Program: Hints Of Na I And Evidence Of A Cloudy Atmosphere For The Inflated Hot Jupiter Wasp-52b, Munazza K. Alam, Nikolay Nikolov, Mercedes López-Morales, David K. Sing, Jayesh M. Goyal, Gregory W. Henry, Jorge Sanz-Forcada, Michael H. Williamson, Thomas M. Evans, Hannah R. Wakeford, Giovanni Bruno, Gilda E. Ballester, Kevin B. Stevenson, Nikole K. Lewis, Joanna K. Barstow, Vincent Bourrier, Lars A. Buchhave, David Ehrenreich, Antonio García Muñoz

Information Systems and Engineering Management Research Publications

We present an optical to near-infrared transmission spectrum of the inflated hot Jupiter WASP-52b using three transit observations from the Space Telescope Imaging Spectrograph mounted on the Hubble Space Telescope, combined with Spitzer/Infrared Array Camera photometry at 3.6 and 4.5 μm. Since WASP-52 is a moderately active (log(Lx/Lbol) = −4.7) star, we correct the transit light curves for the effect of stellar activity using ground-based photometric monitoring data from the All-sky Automated Survey for Supernovae (ASAS-SN) and Tennessee State University's Automatic Imaging Telescope. We bin the data in 38 spectrophotometric light curves from 0.29 to 4.5 μm and measure the …

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Covariations Of Chromospheric And Photometric Variability Of The Young Sun Analogue Hd 30495: Evidence For And Interpretation Of Mid-Term Periodicities, Willie Soon, Victor M. Velasco Herrera, Rodolfo G. Cionco, S. Qiu, Sallie Baliunas, Ricky Egeland, Gregory W. Henry, Ivanka Charvátová Dec 2018

Covariations Of Chromospheric And Photometric Variability Of The Young Sun Analogue Hd 30495: Evidence For And Interpretation Of Mid-Term Periodicities, Willie Soon, Victor M. Velasco Herrera, Rodolfo G. Cionco, S. Qiu, Sallie Baliunas, Ricky Egeland, Gregory W. Henry, Ivanka Charvátová

Information Systems and Engineering Management Research Publications

This study reports the synchronization between the chromospheric and photometric variability at time-scale of about 1.6–1.8 yr as observed for the young, rapidly rotating solar analogue HD 30495. In addition, HD 30495 may be presenting evidence of surface differential rotation at time-scales of about 11 d and 21 d, as well as the sunspot-like decadal cycles at 11–12 yr or so. We apply a new gapped wavelet method of time–frequency analysis for studying the variability in a new composite of the chromospheric S-index (1967–2018) and the longest photometric Δ(b + y)/2 index (1993–2018). We discuss and interpret our results in …

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Detection Of Helium In The Atmosphere Of The Exo-Neptune Hat-P-11b, Megan Mansfield, Jacob L. Bean, Antonija Oklopčić, Laura Kreidberg, Jean-Michel Désert, Eliza M. R. Kempton, Michael R. Line, Jonathan J. Fortney, Gregory W. Henry, Matthias Mallonn, Kevin B. Stevenson, Diana Dragomir, Romain Allart, Vincent Bourrier Nov 2018

Detection Of Helium In The Atmosphere Of The Exo-Neptune Hat-P-11b, Megan Mansfield, Jacob L. Bean, Antonija Oklopčić, Laura Kreidberg, Jean-Michel Désert, Eliza M. R. Kempton, Michael R. Line, Jonathan J. Fortney, Gregory W. Henry, Matthias Mallonn, Kevin B. Stevenson, Diana Dragomir, Romain Allart, Vincent Bourrier

Information Systems and Engineering Management Research Publications

The helium absorption triplet at a wavelength of 10833 Å has been proposed as a way to probe the escaping atmospheres of exoplanets. Recently this feature was detected for the first time using Hubble Space Telescope (HST) WFC3 observations of the hot Jupiter WASP-107b. We use similar HST/WFC3 observations to detect helium in the atmosphere of the hot Neptune HAT-P-11b at the 4σ confidence level. We compare our observations to a grid of 1D models of hydrodynamic escape to constrain the thermospheric temperatures and mass loss rate. We find that our data are best fit by models with high mass …

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An Optical Transmission Spectrum For The Ultra-Hot Jupiter Wasp-121b Measured With The Hubble Space Telescope, Thomas M. Evans, David K. Sing, Jayesh M. Goyal, Nikolay Nikolov, Mark S. Marley, Kevin Zahnle, Gregory W. Henry, Joanna K. Barstow, Munazza K. Alam, Jorge Sanz-Forcada, Tiffany Kataria, Nikole K. Lewis, Panayotis Lavvas, Gilda E. Ballester, Lotfi Ben-Jaffel, Sarah D. Blumenthal, Vincent Bourrier, Benjamin Drummond, Antonio García Muñoz, Mercedes López-Morales, Pascal Tremblin, David Ehrenreich, Hannah R. Wakeford, Lars A. Buchhave, Alain Lecavelier Des Etangs, Éric Hébrard, Michael H. Williamson Nov 2018

An Optical Transmission Spectrum For The Ultra-Hot Jupiter Wasp-121b Measured With The Hubble Space Telescope, Thomas M. Evans, David K. Sing, Jayesh M. Goyal, Nikolay Nikolov, Mark S. Marley, Kevin Zahnle, Gregory W. Henry, Joanna K. Barstow, Munazza K. Alam, Jorge Sanz-Forcada, Tiffany Kataria, Nikole K. Lewis, Panayotis Lavvas, Gilda E. Ballester, Lotfi Ben-Jaffel, Sarah D. Blumenthal, Vincent Bourrier, Benjamin Drummond, Antonio García Muñoz, Mercedes López-Morales, Pascal Tremblin, David Ehrenreich, Hannah R. Wakeford, Lars A. Buchhave, Alain Lecavelier Des Etangs, Éric Hébrard, Michael H. Williamson

Information Systems and Engineering Management Research Publications

We present an atmospheric transmission spectrum for the ultra-hot Jupiter WASP-121b, measured using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. Across the 0.47–1 wavelength range, the data imply an atmospheric opacity comparable to—and in some spectroscopic channels exceeding—that previously measured at near-infrared wavelengths (1.15–1.65 ). Wavelength-dependent variations in the opacity rule out a gray cloud deck at a confidence level of 3.7σ and may instead be explained by VO spectral bands. We find a cloud-free model assuming chemical equilibrium for a temperature of 1500 K and a metal enrichment of 10–30× solar matches …

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The 55 Cancri System Reassessed, Vincent Bourrier, Xavier Dumusque, Caroline Dorn, Gregory W. Henry, Nicola Astudillo-Defru, Javiera Rey, Björn Benneke, Guillaume Hébrard, Christophe Lovis, Brice-Olivier Demory, C. Moutou, David Ehrenreich Oct 2018

The 55 Cancri System Reassessed, Vincent Bourrier, Xavier Dumusque, Caroline Dorn, Gregory W. Henry, Nicola Astudillo-Defru, Javiera Rey, Björn Benneke, Guillaume Hébrard, Christophe Lovis, Brice-Olivier Demory, C. Moutou, David Ehrenreich

Information Systems and Engineering Management Research Publications

Orbiting a bright, nearby star the 55 Cnc system offers a rare opportunity to study a multiplanet system that has a wide range of planetary masses and orbital distances. Using two decades of photometry and spectroscopy data, we have measured the rotation of the host star and its solar-like magnetic cycle. Accounting for this cycle in our velocimetric analysis of the system allows us to revise the properties of the outermost giant planet and its four planetary companions. The innermost planet 55 Cnc e is an unusually close-in super-Earth, whose transits have allowed for detailed follow-up studies. Recent observations favor …

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Separated Fringe Packet Observations With The Chara Array. Iii. The Very High-Eccentricity Binary Hr 7345, Chris D. Farrington, Francis C. Fekel, Gail Schaefer, Theo A. Ten Brummelaar Sep 2018

Separated Fringe Packet Observations With The Chara Array. Iii. The Very High-Eccentricity Binary Hr 7345, Chris D. Farrington, Francis C. Fekel, Gail Schaefer, Theo A. Ten Brummelaar

Information Systems and Engineering Management Research Publications

After an 11-year observing campaign, we present the combined visual–spectroscopic orbit of the formerly unremarkable bright star HR 7345 (HD 181655, HIP 94981, GJ 754.2). Using the Separated Fringe Packet method with the CHARA Array, we were able to determine a difficult-to-complete orbital period of 331.609 ± 0.004 days. The 11-month period causes the system to be hidden from interferometric view behind the Sun for three years at a time. Due to the high-eccentricity orbit of about 90% of a year, after 2018 January the periastron phase will not be observable again until late 2021. Hindered by its extremely high …

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Spectroscopic Orbits For Late-Type Stars. Ii, Francis C. Fekel, Daryl W. Willmarth, Helmut A. Abt, Dimitri Pourbaix Aug 2018

Spectroscopic Orbits For Late-Type Stars. Ii, Francis C. Fekel, Daryl W. Willmarth, Helmut A. Abt, Dimitri Pourbaix

Information Systems and Engineering Management Research Publications

We have determined spectroscopic orbital elements for 13 systems—10 single-lined binaries and three double-lined binaries. For the three binaries with previously published spectroscopic orbits, we have computed improved or comparable elements. While two systems have relatively short periods between 10 and 19 days, the remaining systems have much longer periods ranging from 604 to 9669 days. One of the single-lined systems, HD 142640, shows both short-period and long-period velocity variations and so is triple. For three systems—HD 59380, HD 160933, and HD 161163—we have combined our spectroscopic results with Hipparcos astrometric observations to obtain astrometric orbits. For HD 14802 we …

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The First Super-Earth Detection From The High Cadence And High Radial Velocity Precision Dharma Planet Survey, Bo Ma, Jian Ge, Matthew Muterspaugh, Michael A. Singer, Gregory W. Henry, Jonay I. González Hernández, Sirinrat Sithajan, Sarik Jeram, Michael H. Williamson, Keivan Stassun, Benjamin Kimock, Frank Varosi, Sidney Schofield, Jian Liu, Scott Powell, Anthony Cassette, Hali Jakeman, Louis Avner, Nolan Grieves, Rory Barnes, Bo Zhao, Sankalp Gilda, Jim Grantham, Greg Stafford, David Savage, Steve Bland, Brent Ealey Jul 2018

The First Super-Earth Detection From The High Cadence And High Radial Velocity Precision Dharma Planet Survey, Bo Ma, Jian Ge, Matthew Muterspaugh, Michael A. Singer, Gregory W. Henry, Jonay I. González Hernández, Sirinrat Sithajan, Sarik Jeram, Michael H. Williamson, Keivan Stassun, Benjamin Kimock, Frank Varosi, Sidney Schofield, Jian Liu, Scott Powell, Anthony Cassette, Hali Jakeman, Louis Avner, Nolan Grieves, Rory Barnes, Bo Zhao, Sankalp Gilda, Jim Grantham, Greg Stafford, David Savage, Steve Bland, Brent Ealey

Information Systems and Engineering Management Research Publications

The Dharma Planet Survey (DPS) aims to monitor about 150 nearby very bright FGKM dwarfs (within 50 pc) during 2016–2020 for low-mass planet detection and characterization using the TOU very high resolution optical spectrograph (⁠R≈100000⁠, 380–900 nm). TOU was initially mounted to the 2-m Automatic Spectroscopic Telescope at Fairborn Observatory in 2013–2015 to conduct a pilot survey, then moved to the dedicated 50-inch automatic telescope on Mt. Lemmon in 2016 to launch the survey. Here, we report the first planet detection from DPS, a super-Earth candidate orbiting a bright K dwarf star, HD 26965. It is the second brightest star …

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Global Climate And Atmospheric Composition Of The Ultra-Hot Jupiter Wasp-103b From Hst And Spitzer Phase Curve Observations, Laura Kreidberg, Michael R. Line, Vivien Parmentier, Kevin B. Stevenson, Tom Louden, Mickäel Bonnefoy, Jacqueline K. Faherty, Gregory W. Henry, Michael H. Williamson, Keivan Stassun, Thomas G. Beatty, Jacob L. Bean, Jonathan J. Fortney, Adam P. Showman, Jean-Michel Désert, Jacob Arcangeli Jun 2018

Global Climate And Atmospheric Composition Of The Ultra-Hot Jupiter Wasp-103b From Hst And Spitzer Phase Curve Observations, Laura Kreidberg, Michael R. Line, Vivien Parmentier, Kevin B. Stevenson, Tom Louden, Mickäel Bonnefoy, Jacqueline K. Faherty, Gregory W. Henry, Michael H. Williamson, Keivan Stassun, Thomas G. Beatty, Jacob L. Bean, Jonathan J. Fortney, Adam P. Showman, Jean-Michel Désert, Jacob Arcangeli

Information Systems and Engineering Management Research Publications

We present thermal phase curve measurements for the hot Jupiter WASP-103b observed with Hubble/WFC3 and Spitzer/IRAC. The phase curves have large amplitudes and negligible hotspot offsets, indicative of poor heat redistribution to the nightside. We fit the phase variation with a range of climate maps and find that a spherical harmonics model generally provides the best fit. The phase-resolved spectra are consistent with blackbodies in the WFC3 bandpass, with brightness temperatures ranging from 1880 ± 40 K on the nightside to 2930 ± 40 K on the dayside. The dayside spectrum has a significantly higher brightness temperature in the Spitzer …

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Helium In The Eroding Atmosphere Of An Exoplanet, Jess J. Spake, David K. Sing, Tom M. Evans, Antonija Oklopčić, Vincent Bourrier, Laura Kreidberg, Benjamin V. Rackham, Jonathan Irwin, David Ehrenreich, Aurélien Wyttenbach, Hannah R. Wakeford, Yifan Zhou, Katy L. Chubb, Nikolay Nikolov, Jayesh M. Goyal, Gregory W. Henry, Michael H. Williamson, Sarah Blumenthal, David R. Anderson, Coel Hellier, David Charbonneau, Stephane Udry, Nikku Madhusudhan May 2018

Helium In The Eroding Atmosphere Of An Exoplanet, Jess J. Spake, David K. Sing, Tom M. Evans, Antonija Oklopčić, Vincent Bourrier, Laura Kreidberg, Benjamin V. Rackham, Jonathan Irwin, David Ehrenreich, Aurélien Wyttenbach, Hannah R. Wakeford, Yifan Zhou, Katy L. Chubb, Nikolay Nikolov, Jayesh M. Goyal, Gregory W. Henry, Michael H. Williamson, Sarah Blumenthal, David R. Anderson, Coel Hellier, David Charbonneau, Stephane Udry, Nikku Madhusudhan

Information Systems and Engineering Management Research Publications

Helium is the second-most abundant element in the Universe after hydrogen and is one of the main constituents of gas-giant planets in our Solar System. Early theoretical models predicted helium to be among the most readily detectable species in the atmospheres of exoplanets, especially in extended and escaping atmospheres1. Searches for helium, however, have hitherto been unsuccessful2. Here we report observations of helium on an exoplanet, at a confidence level of 4.5 standard deviations. We measured the near-infrared transmission spectrum of the warm gas giant3 WASP-107b and identified the narrow absorption feature of excited metastable helium at 10,833 angstroms. The …

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Patterns Of Variation For The Sun And Sun-Like Stars, Richard R. Radick, G. Wesley Lockwood, Gregory W. Henry, Jeffrey C. Hall, Alexei A. Pevtsov Mar 2018

Patterns Of Variation For The Sun And Sun-Like Stars, Richard R. Radick, G. Wesley Lockwood, Gregory W. Henry, Jeffrey C. Hall, Alexei A. Pevtsov

Information Systems and Engineering Management Research Publications

We compare patterns of variation for the Sun and 72 Sun-like stars by combining total and spectral solar irradiance measurements between 2003 and 2017 from the SORCE satellite, Strömgren b, y stellar photometry between 1993 and 2017 from Fairborn Observatory, and solar and stellar chromospheric Ca ii H+K emission observations between 1992 and 2016 from Lowell Observatory. The new data and their analysis strengthen the relationships found previously between chromospheric and brightness variability on the decadal timescale of the solar activity cycle. Both chromospheric H+K and photometric b, y variability among Sun-like stars are related to average chromospheric activity by …

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Precision Orbit Of Δ Delphini And Prospects For Astrometric Detection Of Exoplanets, Tyler Gardner, John D. Monnier, Francis C. Fekel, Michael H. Williamson, Douglas K. Duncan, Timothy R. White, Michael Ireland, Fred C. Adams, Travis Barman, Fabien Baron, Theo A. Ten Brummelaar, Xiao Che, Daniel Huber, Stefan Kraus, Rachael M. Roettenbacher, Gail Schaefer, Judit Sturmann, Laszlo Sturmann, Samuel J. Swihart, Ming Zhao Feb 2018

Precision Orbit Of Δ Delphini And Prospects For Astrometric Detection Of Exoplanets, Tyler Gardner, John D. Monnier, Francis C. Fekel, Michael H. Williamson, Douglas K. Duncan, Timothy R. White, Michael Ireland, Fred C. Adams, Travis Barman, Fabien Baron, Theo A. Ten Brummelaar, Xiao Che, Daniel Huber, Stefan Kraus, Rachael M. Roettenbacher, Gail Schaefer, Judit Sturmann, Laszlo Sturmann, Samuel J. Swihart, Ming Zhao

Information Systems and Engineering Management Research Publications

Combining visual and spectroscopic orbits of binary stars leads to a determination of the full 3D orbit, individual masses, and distance to the system. We present a full analysis of the evolved binary system δ Delphini using astrometric data from the MIRC and PAVO instruments on the CHARA long-baseline interferometer, 97 new spectra from the Fairborn Observatory, and 87 unpublished spectra from the Lick Observatory. We determine the full set of orbital elements for δ Del, along with masses of 1.78 ± 0.07 M⊙ and 1.62 ± 0.07 M⊙ for each component, and a distance of 63.61 ± 0.89 pc. …

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The First Post-Kepler Brightness Dips Of Kic 8462852, Tabetha S. Boyajian, Roi Alonso, Alex Ammerman, David Armstrong, Andrés Asensio Ramos, K. Barkaoui, Thomas G. Beatty, Zouhair Benkhaldoun, Paul Benni, Rory O. Bentley, Andrei Berdyugin, Svetlana Berdyugina, Serge Bergeron, Allyson Bieryla, Michaela G. Blain, Alicia Capetillo Blanco, Eva H. L. Bodman, Anne Boucher, Mark Bradley, Stephen M. Brincat, Thomas G. Brink, John Briol, David J. A. Brown, Jan Budaj, Artem Burdanov, Bryson Cale, Miguel Aznar Carbo, R. Castillo García, Wendy J. Clark, Geoffrey C. Clayton, James L. Clem, Phillip H. Coker, Evan M. Cook, Chris M. Copperwheat, Jason L. Curtis, Roc M. Cutri, Borbála Cseh, C. H. Cynamon, Alex J. Daniels, James R. A. Davenport, Hans J. Deeg, Roberto De Lorenzo, Thomas De Jaeger, Jean-Bruno Desrosiers, John Dolan, D. J. Dowhos, Franky Dubois, Russell Durkee, Shawn Dvorak, Lynn Easley, Nick Edwards, Tyler G. Ellis, Emery Erdelyi, Steve Ertel, Rafael G. Farfán, Jay Farihi, Alexei V. Filippenko, Emma Foxell, Davide Gandolfi, Faustino Garcia, Frank Giddens, Michaël Gillon, Juan-Luis González-Carballo, Carlos González-Fernández, Jonay I. González Hernández, Keith A. Graham, Kenton A. Greene, Joao Gregorio, Na'ama Hallakoun, Ottó Hanyecz, Gerry R. Harp, Gregory W. Henry, E. Herrero, Caleb F. Hildbold, D. Hinzel, Gonzalo Holgado, Bernadett Ignácz, Ilya Ilyin, Valentin D. Ivanov, ‪Emmanuel Jehin, Helen E. Jermak, Steve Johnston, Stella Kafka, Csilla Kalup, Emmanuel Kardasis, Shai Kaspi, Grant M. Kennedy, F. Kiefer, Collin L. Kielty, Dennis Kessler, Harri Kiiskinen, Thomas L. Killestein, Ronald A. King, Vladimír Kollar, Heidi Korhonen, C. Kotnik, Réka Könyves-Tóth, Levente Kriskovics, Nathan Krumm, Vadim Krushinsky, E. Kundra, Francois-Rene Lachapelle, Daryll Lacourse, P. Lake, Kristine Lam, Gavin P. Lamb, Dave Lane, Marie Wingyee Lau, Pablo Lewin, Chris Lintott, Carey Lisse, Ludwig Logie, Nicolas Longeard, M. Lopez Villanueva, E. Whit Ludington, Amy Mainzer, Lison Malo, Chris Maloney, Andrew Mann, A. Mantero, Massimo Marengo, Jon Marchant, María Jesús Martínez González, Joseph R. Masiero, Jon C. Mauerhan, James Mccormac, Aaron Mcneely, Huan Y. A. Meng, Mike Miller, Lawrence A. Molnar, Juan Carlos Morales, Brett M. Morris, Matthew W. Muterspaugh, David Nespra, Carrie R. Nugent, Katherine M. Nugent, A. Odasso, Derek O'Keeffe, Arto Oksanen, John M. O'Meara, András Ordasi, Hugh Osborn, John J. Ott, J. R. Parks, Diego Rodriguez Perez, Vance Petriew, Roger Pickard, András Pál, Peter Plavchan, Don Pollacco, Francisco Pozo-Nuñez, Francisco J. Pozuelos, Steve Rau, Seth Redfield, Howard Relles, Ignasi Ribas, Jon Richards, Joonas L. O. Saario, Emily J. Safron, J. Martin Sallai, Krisztián Sárneczky, Bradley E. Schaefer, Clea F. Schumer, Madison Schwartzendruber, Michael H. Siegel, Andrew P. V. Siemion, Brooke D. Simmons, Joshua D. Simon, Sergio Simón-Díaz, Michael L. Sitko, Hector Socas-Navarro, Ádám Sódor, Donn Starkey, Iain A. Steele, Geoff Stone, Klaus G. Strassmeier, Rachel A. Street, Tricia Sullivan, Jari Suomela, Jon J. Swift, Gyula M. Szabó, Róbert Szabó, Róbert Szakáts, Tamás Szalai, Angelle M. Tanner, Borja Toledo-Padrón, Tamás Tordai, Amaury H. M. J. Triaud, Jake D. Turner, Joseph H. Ulowetz, Marian Urbanik, Siegfried Vanaverbeke, Andrew Vanderburg, Krisztián Vida, Brad P. Vietje, József Vinkó, Kaspar Von Braun, Elizabeth O. Waagen, Dan Walsh, Christopher A. Watson, R. C. Weir, Klaus Wenzel, Carlos Westendorp, Michael W. Williamson, Jason T. Wright, Mark C. Wyatt, Weikang Zheng, Gabriella Zsidi Jan 2018

The First Post-Kepler Brightness Dips Of Kic 8462852, Tabetha S. Boyajian, Roi Alonso, Alex Ammerman, David Armstrong, Andrés Asensio Ramos, K. Barkaoui, Thomas G. Beatty, Zouhair Benkhaldoun, Paul Benni, Rory O. Bentley, Andrei Berdyugin, Svetlana Berdyugina, Serge Bergeron, Allyson Bieryla, Michaela G. Blain, Alicia Capetillo Blanco, Eva H. L. Bodman, Anne Boucher, Mark Bradley, Stephen M. Brincat, Thomas G. Brink, John Briol, David J. A. Brown, Jan Budaj, Artem Burdanov, Bryson Cale, Miguel Aznar Carbo, R. Castillo García, Wendy J. Clark, Geoffrey C. Clayton, James L. Clem, Phillip H. Coker, Evan M. Cook, Chris M. Copperwheat, Jason L. Curtis, Roc M. Cutri, Borbála Cseh, C. H. Cynamon, Alex J. Daniels, James R. A. Davenport, Hans J. Deeg, Roberto De Lorenzo, Thomas De Jaeger, Jean-Bruno Desrosiers, John Dolan, D. J. Dowhos, Franky Dubois, Russell Durkee, Shawn Dvorak, Lynn Easley, Nick Edwards, Tyler G. Ellis, Emery Erdelyi, Steve Ertel, Rafael G. Farfán, Jay Farihi, Alexei V. Filippenko, Emma Foxell, Davide Gandolfi, Faustino Garcia, Frank Giddens, Michaël Gillon, Juan-Luis González-Carballo, Carlos González-Fernández, Jonay I. González Hernández, Keith A. Graham, Kenton A. Greene, Joao Gregorio, Na'ama Hallakoun, Ottó Hanyecz, Gerry R. Harp, Gregory W. Henry, E. Herrero, Caleb F. Hildbold, D. Hinzel, Gonzalo Holgado, Bernadett Ignácz, Ilya Ilyin, Valentin D. Ivanov, ‪Emmanuel Jehin, Helen E. Jermak, Steve Johnston, Stella Kafka, Csilla Kalup, Emmanuel Kardasis, Shai Kaspi, Grant M. Kennedy, F. Kiefer, Collin L. Kielty, Dennis Kessler, Harri Kiiskinen, Thomas L. Killestein, Ronald A. King, Vladimír Kollar, Heidi Korhonen, C. Kotnik, Réka Könyves-Tóth, Levente Kriskovics, Nathan Krumm, Vadim Krushinsky, E. Kundra, Francois-Rene Lachapelle, Daryll Lacourse, P. Lake, Kristine Lam, Gavin P. Lamb, Dave Lane, Marie Wingyee Lau, Pablo Lewin, Chris Lintott, Carey Lisse, Ludwig Logie, Nicolas Longeard, M. Lopez Villanueva, E. Whit Ludington, Amy Mainzer, Lison Malo, Chris Maloney, Andrew Mann, A. Mantero, Massimo Marengo, Jon Marchant, María Jesús Martínez González, Joseph R. Masiero, Jon C. Mauerhan, James Mccormac, Aaron Mcneely, Huan Y. A. Meng, Mike Miller, Lawrence A. Molnar, Juan Carlos Morales, Brett M. Morris, Matthew W. Muterspaugh, David Nespra, Carrie R. Nugent, Katherine M. Nugent, A. Odasso, Derek O'Keeffe, Arto Oksanen, John M. O'Meara, András Ordasi, Hugh Osborn, John J. Ott, J. R. Parks, Diego Rodriguez Perez, Vance Petriew, Roger Pickard, András Pál, Peter Plavchan, Don Pollacco, Francisco Pozo-Nuñez, Francisco J. Pozuelos, Steve Rau, Seth Redfield, Howard Relles, Ignasi Ribas, Jon Richards, Joonas L. O. Saario, Emily J. Safron, J. Martin Sallai, Krisztián Sárneczky, Bradley E. Schaefer, Clea F. Schumer, Madison Schwartzendruber, Michael H. Siegel, Andrew P. V. Siemion, Brooke D. Simmons, Joshua D. Simon, Sergio Simón-Díaz, Michael L. Sitko, Hector Socas-Navarro, Ádám Sódor, Donn Starkey, Iain A. Steele, Geoff Stone, Klaus G. Strassmeier, Rachel A. Street, Tricia Sullivan, Jari Suomela, Jon J. Swift, Gyula M. Szabó, Róbert Szabó, Róbert Szakáts, Tamás Szalai, Angelle M. Tanner, Borja Toledo-Padrón, Tamás Tordai, Amaury H. M. J. Triaud, Jake D. Turner, Joseph H. Ulowetz, Marian Urbanik, Siegfried Vanaverbeke, Andrew Vanderburg, Krisztián Vida, Brad P. Vietje, József Vinkó, Kaspar Von Braun, Elizabeth O. Waagen, Dan Walsh, Christopher A. Watson, R. C. Weir, Klaus Wenzel, Carlos Westendorp, Michael W. Williamson, Jason T. Wright, Mark C. Wyatt, Weikang Zheng, Gabriella Zsidi

Information Systems and Engineering Management Research Publications

We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in 2015 October, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1%–2.5% dips, named "Elsie," "Celeste," "Skara Brae," and "Angkor," which persist on timescales from several days to weeks. Our main results so far are as follows: (i) there are no apparent changes of the stellar …

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An Hst/Stis Optical Transmission Spectrum Of Warm Neptune Gj 436b, Joshua D. Lothringer, Björn Benneke, Ian J. M. Crossfield, Gregory W. Henry, Caroline Morley, Diana Dragomir, Travis Barman, Heather Knutson, Eliza Kempton, Jonathan J. Fortney, Peter Mccullough, Andrew W. Howard Jan 2018

An Hst/Stis Optical Transmission Spectrum Of Warm Neptune Gj 436b, Joshua D. Lothringer, Björn Benneke, Ian J. M. Crossfield, Gregory W. Henry, Caroline Morley, Diana Dragomir, Travis Barman, Heather Knutson, Eliza Kempton, Jonathan J. Fortney, Peter Mccullough, Andrew W. Howard

Information Systems and Engineering Management Research Publications

GJ 436b is a prime target for understanding warm Neptune exoplanet atmospheres and a target for multiple James Webb Space Telescope (JWST) Guaranteed Time Observation programs. Here, we report the first space-based optical transmission spectrum of the planet using two Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) transit observations from 0.53 to 1.03 μm. We find no evidence for alkali absorption features, nor evidence of a scattering slope longward of 0.53 μm. The spectrum is indicative of moderate to high metallicity (∼100–1000× solar), while moderate-metallicity scenarios (∼100× solar) require aerosol opacity. The optical spectrum also rules out some …

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Differential Rotation In Magnetic Chemically Peculiar Stars, Zdeněk Mikulášek, Jiří Krtička, Ernst Paunzen, Michal Švanda, Stefan Hummerich, Klaus Bernhard, Miroslav Jagelka, Jan Janík, Gregory W. Henry, Matthew E. Shultz Jan 2018

Differential Rotation In Magnetic Chemically Peculiar Stars, Zdeněk Mikulášek, Jiří Krtička, Ernst Paunzen, Michal Švanda, Stefan Hummerich, Klaus Bernhard, Miroslav Jagelka, Jan Janík, Gregory W. Henry, Matthew E. Shultz

Information Systems and Engineering Management Research Publications

Magnetic chemically peculiar (mCP) stars constitute about 10% of upper-main-sequence stars and are characterized by strong magnetic fields and abnormal photospheric abundances of some chemical elements. Most of them exhibit strictly periodic light, magnetic, radio, and spectral variations that can be fully explained by a rigidly rotating main-sequence star with persistent surface structures and a stable global magnetic field. Long-term observations of the phase curves of these variations enable us to investigate possible surface differential rotation with unprecedented accuracy and reliability. The analysis of the phase curves in the best-observed mCP stars indicates that the location and the contrast of …

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